Deep structure of the Median Tectonic Line revealed by an integrated seismic profiling across the Seto Inland Sea

濑户内海综合地震剖面揭示中位构造线的深层结构

• 批准号: 14204048
• 负责人: ITO Tanio
• 金额: $ 34.86万
• 依托单位: Chiba University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (A)
• 财政年份: 2002
• 资助国家: 日本
• 起止时间: 2002 至 2003
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-14204048/
• 关键词: Seto-Shikoku profile; Southwest Japan; Median Tectonic Line; seismic profiling; Philippine Sea Plate; lower crust; Aki fault; 瀬戸内海

Trans-Seto and Shikoku seismic reflection profiling was made as a joint expedition of ERI, JAMSTEC and our research group based on this grant, the end of August, 2002. The deep crustal structure was indicated in an integrated profile of single-fold profiles. Significant results are summarized as follows :1.The subducting Philippine Sea plate (PHS) is clearly recognized as a combination of reflective layers 1+2 and transparent layer 3.2.The lower crust of the Japanese island arc is gently dipping southward and comes into contact with the PHS beneath the middle Shikoku.3.The Median Tectonic Line (MTL) is dipping at about 30 degrees and merges into the lower crust beneath the Seto Inland Sea.4.Major boundary faults, the Butsuzo Tectonic Line (BTL) and the Aki fault (AF) in the accretionary complexes are dipping northward and merges into the lower crust beneath the Seto Inland Sea.

transseto和四国地震反射剖面是ERI， JAMSTEC和我们的研究小组在2002年8月底基于这项拨款的联合考察。以单褶剖面的综合剖面显示了深部地壳结构。主要研究结果如下：俯冲菲律宾海板块（PHS）是由1+2反射层和3.2透明层组成。日本岛弧的下地壳缓慢向南倾斜，并与四国中部下方的小灵通接触。中构造线（MTL）倾斜约30度，并入濑户内海下地壳。主要的边界断裂，即增生杂岩中的Butsuzo构造线（BTL）和Aki断裂（AF）向北倾入濑户内海下地壳。

项目成果

Miyauchi, T., Tanaka, T., Ito, T., others: "Active tectonics of the Kannawa-Kozu-Matsuda fault system developed as a thrust-front migration process, central Japan, analyzed by seismic reflection profiling"Deep Seismic Profiling of the Continents and their

Miyauchi, T.、Tanaka, T.、Ito, T.等人：“通过地震反射剖面分析，日本中部作为逆冲前移过程而发展起来的铁轮-神津-松田断层系的活动构造”深地震剖面

Tsurumi, J., Hosonuma, H., Kanagawa, K.: "Strain localization due to a positive feedback of deformation and myrmekite-forming reaction in granite and aplite mylonites along the Hatagawa Shear Zone of NE Japan."Journal of Structural Geology. 25. 557-584 (2

鹤见 J.、细沼 H.、神奈川 K.：“日本东北部波田剪切带花岗岩和细粒糜棱岩变形和磁石形成反应的正反馈导致应变局部化。”结构地质学杂志。

Ito, T: "Active faulting, lower crustal delamination and ongoing Hidaka arc-arc collision, Hokkaido, Japan."Seismotectonics in Convergent Plate Boundary (Y.Fujinawa et al., eds.). 219-224 (2002)

Ito, T：“活动断层、下地壳分层和正在进行的日高弧-弧碰撞，日本北海道。”汇聚板块边界中的地震构造（Y.Fujinawa 等人编辑）。

宮脇崇裕(分担): "日本の地形2 北海道"東京大学出版会. 359 (2003)

Takahiro Miyawaki（撰稿人）：《日本地形 2 北海道》东京大学出版社 359（2003 年）。

Imon, R., Okudaira, T., Kanagawa, K.: "Development of shape- and lattice-preferred orientations of amphibole grains during initial cataclastic deformation and subsequent deformation by dissolution-precipitation"Journal of Structural Geology. 26(5). 793-80

Imon, R.、Okudaira, T.、Kanagawa, K.：“在初始碎裂变形和随后的溶解-沉淀变形过程中角闪石晶粒的形状和晶格择优取向的发展”《结构地质学杂志》。